例如，野生小麦成熟的麦粒会垂向地面，有些会碎裂开来，这样植物便可以自我播种。
Wild wheat, for example, drops its ripened kernels to the ground, or shatters, so that the plant can reseed itself.
东北部生态农业建设区由于耕地面积较少和人口较多的原因，粮食作物播种面积已无压缩余地。
The northeast ecological agriculture region has no space to adjust the crops sown area for the more population and few land.
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